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Intangible Assets (Details)
$ in Millions
9 Months Ended
Sep. 30, 2017
USD ($)
Goodwill  
Balance, beginning of period $ 766
Goodwill acquired during period 4
Loss on impairment (262)
Balance, end of period 508
U.S. Cellular  
Goodwill  
Balance, beginning of period 227
Goodwill acquired during period 0
Loss on impairment (227)
Balance, end of period 0
TDS Telecom Wireline  
Goodwill  
Balance, beginning of period 409
Goodwill acquired during period 0
Loss on impairment 0
Balance, end of period 409
TDS Telecom Cable  
Goodwill  
Balance, beginning of period 95
Goodwill acquired during period 4
Loss on impairment 0
Balance, end of period 99
TDS Telecom HMS  
Goodwill  
Balance, beginning of period 35
Goodwill acquired during period 0
Loss on impairment (35)
Balance, end of period 0
Licenses  
Licenses  
Balance, beginning of period 1,895
Acquisitions 331
Transferred to Assets held for sale (5)
Exchanges - Licenses received 18
Exchanges - Licenses surrendered (5)
Balance, end of period $ 2,234